Framing mechanism for motion picture machines



July 28, 1936. BERGGREN 2,049,042

FRAMING MECHANISM FOR MOTION PICTURE MACHINES Original Filed Dec. 20,1923 FL 3. V A per Johan B er g gnn.

INVENTOR.

BY W A TORNE Patented July 28, 1936 PATENT OFFICE FRAMING MECHANISM FORMOTION PICTURE MACHINES Per Johan Berggren, New York, N. Y.

Original application December 20, 1928, Serial No. 327,200. Divided andthis application May 5, 1933, Serial No. 669,521. Renewed JanuaryClaims.

This invention relates to motion picture apparatus and withparticularity to improved framing mechanism for projecting machines.

An object of the invention is to provide a 5 mechanism whereby theframes of an intermittently movingmotion picture film may be adjustedinto proper registry with a projection aperture.

A feature of the invention relates to the manner of mounting the usualintermittent feed sprocket on a vertically adjustable frame.

Other features and advantages relate to the organisation, arrangementand relative location of which go to make up an efficient and easilyattachable framing mechanism for motion picture projectors.

Other features and advantages of the invention not specificallyenumerated will be apparent after a consideration of the followingdetail de- 2f) scriptions and the appended claims.

Referring to the drawing:

Fig. 1 is a partial view of a motion picture jector illustrating theparticularly adjustable framing mechanism of the invention;

Fig. 2 is a vertical sectional view along the line 2-2 of Fig. 1;

Figure 3 is a broken sectional view taken. along the line 3-3 of it.

While the framing mechanism according to the present invention iscapable of application generally to known t mes of motion pictureprojectors,

it is of outstanding advantage when. applied to a projector of the typedisclosed in application Serial No. 327,200 to which reference may behad for a detail description of the parts of the pro- Jector notdisclosed in the present application. Since the present applicationrelates solely to the framing mechanism, only that portion of theprojector is shown to enable a clear understanding to be attained of themethod of adjusting the frame device.

Accordingly the upper part of Fig. 2 shows the back plate of film gateI0 having a projection.

aperture 5 therein and past which the motion pictureillm is adapted tobe moved in an intermittent manner as described in detail in saidapplication Serial No. 327,200. The motion picture film after passingthe aperture I 45 engages the 55 mounted in a frame 00 which alsocarries a hori- (Cl. 88-17 I zontal shaft 98 provided with suitablejournal bearings in the said frame. Shaft 98 is coupled through suitableintermediate gears to the continuously revolving finger of the Genevamovement shown generally at H in Fig. 3. Shaft 98 5 7 extends through awall of the housing and carries at its left hand end a bevel. gear Qlawhich cooperates with corresponding bevel gear Elli splined for verticalmovement on the main vertical shaft Gear Qlh rests on the ere in tension9 the frame Consequently as frame Q? hove-:1 vertically both gearsSicand 912) are likewise moved vertically and thus maim tamed in properdriving relation. The geariil'o is capable of vertical sliding movementon shaft l5 til at the same time that it is being; rotated thereby. adetail description oi" the manner oi driving the shafts 9i and referencemay be had to said application Elerial No.32l2oi The frame t9 carryingthe intermediate eed 9O sprocket device lot is adapted to he adju ed invertical direction on the standard HZ. fastened in bracket attached tothe main housing of the projector head. For this purpose the frame soprovided with a threaded portion 6 i to through 25 which passes thecorresponding threaded end of. a rod 5 ii. Hod iii is mounted forsuitable rotation in the fixed brackets Hit) and tile and carries at itslower end a bevel gear lite which cooperates with another bevel gear me.Bevel 30 gear filth is provided with an adjusting hand wheel its.Consequently as the wheel It is turned the rod HI translates the rotarymovement of the hand wheel into a vertical movement of the frame 99 andthe intermittent sprocket 35 device I00. Since the gears 91b and 910.are likewise moved vertically this adjustment does not. interfere withthe intermittent rotation of the sprocket I00. Consequently the pictureframes may be accurately brought into register with the l? projectionapertures I45 without interfering with the intermittent motion of thefilm.

Secured to frame 99, as shown in Fig. 2, is a plate I52, which is curvedupwardly around the front of the sprocket I00 into a portion I53, which5 is provided at its end with a plurality of grooves I54 forming, spacedfingers I55. The lower end of the back plate ID ofthe film gate islikewise provided with slots I forming spaced fingers l5l. As will beseen from Fig. 1, the slots and 5G fingers of these two plates arerelatively placed so that the fingers of each member slidably engage inthe slots of the other member.

-The purpose of this structure as clearly set forth in said applicationSerial No. 827,200, is 55 to provide a continuous guide surface for thefilm without interfering with the vertical adjustment of the carriage 99and the parts attached thereto. For all positions of the carriage andthe parts attached thereto the fingers of these members intermesh or areinterleaved, or telescoped, so as to provide a continuous guidingsurface along which the film may move.

As is apparent from the figures, and particularly Fig. 2, the back plateIn and the portion I53 of the guide plate I52, including the cooperatingfingers lie in the same plane, so as to provide a continuous smoothguide surface for the film. The purpose of this structure is to preventany movement of the film in a direction transverse to its length underthe forces which act on the film when it is brought to a stop.Obviously, any such transverse movement will have components in thedirection of the length of the film, causing it to vibrate at theaperture, with a resultant flicker of the projected picture, which ofcourse is highly undesirable.

The lower ends of the back plate ID of the film guide are also slottedat I56 in alignment with the teeth of the sprocket I00, so'as toaccommodate the sprocket teeth when the sprocket wheel is adjustedtowards this plate.

This application is a division of application Serial No. 327,200, filedDecember 20, 1928.

What is claimed is:

1. In a motion picture apparatus including intermittently acting filmfeeding mechanism and means to vertically adjust the same in combinationwith a gate structure having an aperture with reference to which thefilm is framed by the adjustment of said feeding mechanism, said gatehaving means to support the film above and below the aperture includingtelescoping slots and fingers formed respectively inthe gate and in thefilm feeding adjusting mechanism.

2. In a motion picture apparatus including intermittently acting filmfeeding mechanism and means to vertically adjust the same in combinationwith a gate structure having an aperture with reference to which thefilm is framed by the adjustment or said feeding mechanism, said gatehaving means to support the film above and below the aperture, the lowerportion of said gate having vertical slots, and interleaving fingerscarried by the film feeding adjusting devices to afford a bearingsupport for the film below the aperture.

3. In a motion picture apparatus as described the combination comprisinga film gate having an aperture therein, an intermittently actuated filmfeeding mechanism including a sprocket, a carriage in which saidmechanism is journaled, means for adjusting the carriage in a planeparallel to said gate, and a guide member extending between the sprocketwheel and said gate, said gate and guide member having slots definingfingers which intermesh, and which lie in the same plane.

4. In a motion picture apparatus as described the combination includinga film gate plate having an aperture therein, an intermittently actuatedfeed sprocket, a carriage for supporting the sprocket below said plate,a support for said carriage, means including an adjusting screw formoving said carriage in a plane parallel to said plate, and a guidemember extending between the lower end of said plate and said sprocketwheel, said plate and guide member having transversely displaced slotsforming on each fingers which telescope with the slots of the other.

5. In a motion picture apparatus as described the combination includinga film gate plate having an aperture therein, an intermittently actuatedfeed sprocket, a carriage for supporting the sprocket below said plate,a support for said carriage, means including an adjusting screw formoving said carriage in a plane parallel to said plate, and a guidemember extending between the lower end of said plate and said sprocketwheel, said plate and guide member having transversely displaced slotsforming on each fingers which telescope with the slots of the other,said plate having additional grooves at the lower end in alignment withthe sprocket teeth..

PER JOHAN BERGGREN.

